Ah, thanks!

So, it wouldn't be too hard to put some real-world data against this "carbon blocking the intake port" issue! Some folks on the forum surely must have a boroscope, or access to one. SHOW US YOUR CARBON!

 

A good one is about $2k.
I've seen a few for $600 - $700.
I had one when I was in Maryland, but I had to return it to its owner when I moved.

 

You got that right!

I've met a few people who buy new cars and never change the oil!

They just add it. Then after about 80,000 to 100,000 miles they trade it in.

No one in their right mind would belive RG's statement until they actually met someone like that.

It's true... It's true.... some do not change their oil!

 

Try that on an RX-8 and see what you get.
They only make it about 35k or so...

 

Regarding oil change intervals, if I don't make 3000 miles in 3 months, should I change the oil anyways? I was curious what the max monthly interval should be if I don't drive 3K miles. Thanks!

 

are you saying a omp in a heat soak, is bad????

and that the thing is on the side or right near the exhaust manifold???

is it that easy??

beers

 

^^ Yes.

The beer is chilling - will be ready for consumption very soon!

 

duh,

i would give the bottles a few days... i guessed on the other size...

so we have grassy knowl stuff to cover.

beers

 

Back and to the right, back and to the right.

BTW - what engine oil are you running now and what pre-mix have you settled on (and how much)?

 

pm is good,

i judged buy photo for size.... and

name @ gmail.com is on the money...

beers

 

These are Leading plugs, the trailing plugs is event worse.

the carbon build up with sythetic and semi synthetic used by the previous owner is horrible, look at my old plugs, imagine what if it got into the burning chamber and not the plug chamber. damn...

luckily i am using a new unleader fuel produce by petronas UK, somesort of detergent like fuel that cleans all the carbon build up in our car. it had really improve the condition before i change plug and after i change plug, obviously is better than ever.

guys choose wisely.

 

How your car is running is more important than what the plugs look like. The plugs in the photo had 32,000 miles on them in a well running 8 using Dino Oil changed every 3,500 miles and running name brand gas.

 

Holy $#%* what are those thing sticking on those plug bro? mud?

Bro what is Dino Oil? can give me some clue about this oil?

 

This LINK explains it.

 

Bro got what you mean. but bro still what are those on your plug? not those black carbon, i mean those mud like thingy.

 

Dino Oil MEANS your *beloved so called MINERAL oil that all the fanboys said is good for Rotary*

Synthetic all the way Baby !


Im in the premix game as well, started at about 18300 miles , now Im 18600 miles. Engine revs ALOT smoother, but it has a *funny* smell from the exhaust, just a little bit, not too much. Using the Pennzoil now, got a bottle of Castrol 2 days ago and My Case of Idemitsu just came in yesterday, 2 more fillups, and Im going to use the Castrol first, then Idemitsu after.

 

More like ash.

 

Don't Haynes manuals have color spark plug diagnostic pix on the inside of the back cover? Somebody look there, I'm at work now. Isn't that kind of ash deposition indicitave of oil? (They probably say "bad piston rings causing oil burning" but we know better here.)

 

that's exactly what my plugs looked like when i replaced them at 36,000. now i just put rx7 coppers in there and change them every 10 or so.

 

it's because f the oil injection, it's ash buildup. also the trailing plugs are recessed inside of a hole so all kinds of crap build up on them.

 

my bad, i guess i was inferring too much - that's what i meant/thought was causing the ash buildup

 

Here's another long and technical response for the sake of clarification on some things...

Just to help throw another wrench in the "what is dino oil" description, I feel that saying that conventional comes from decomposing dinosaurs, plants, etc and that synthetics aren't is not entirely accurate. Does anyone remember balancing formulas in chemistry class in school? You'd take one molecule chain and break it down into 2 or more others and just have to make sure that all the elements were accounted for. It wasn't very hard. The end result though is that you get multiple compounds that are obviously different from the original. Combining 2 or more elements into one chain was just as easy.

Now lets apply that to oil. Conventional oil base stocks are literally distilled from base crude oil. There is slightly more to it than that. Through the same process but at different temperatures we also get gasoline, kerosene, diesel fuel, etc... The way these are separated is due to different boiling points for each. By carefully heating up the crude oil and then sending it up a distillation tower, we can monitor temperature and collect at whatever level we want to based on temperature. By doing this we can get any of the compounds. The problem with this is that even though each compound has a different boiling temperature and consequently max temperature of evaporation, each compound is still evaporating and being collected into other levels in small amounts as well. Even though water boils at 212* at sea level and has it's max evaporation at that point, water still evaporates at room temperature too. This means that if we were trying to collect a prodcut we distilled and aimed at 180*, we'd also get a small amount of water as well as the water is still evaporating. Hopefully this makes sense.

When crude is distilled into it's different compounds, there is a small amount of different compounds that get collected with the final product at that temperature. It pretty much only goes one way though. A compound that boils at 200* will still collect some materials from anything that boils above that temperature but typically not the other way around. Compounds higher up lets say with boiling points of 400 degrees are not going to collect compounds that boil at 200 degrees. The higher up the fractioning tower you go, the cooler it gets. Different compounds collect at outlets along the way up.

Any time we get something in the final product that we don't want, we call it an impurity. In oils we may have compounds that we refer to as aromatics as well as some other things that get into the base oil. How well these aromatics are filtered out determines what grade of base stock we have in motor oil. Group I oils have the most contaminants. Up to 10% of the total base stock! Group II oils have a little more distillation (refining) done to bring these contaminants down somewhat. Up to this point we all still agree that we have conventional "dino" oil.

A Group III oil will take the refining process one step farther through a process called hydrocracking. This is whee we go back to the chemistry equation balancing act from above. Through the introduction of hydrogen (hence the "hydro" in hydrocracking)into the mix under high temperatures and pressures, the hydrogen molecules add themselves to the aromatics (contaminants) to completely change their molecular structure into somethig else. The end result is naphtenes and alkines. A chain of napthenes is called paraffins but through the hydrocracking process the aromatics are gone. This is a good thing. Through a simple chemistry formula balancing act in the real world we have taken something we didn't want and rearranged it with some outside help into something we did want. This process is not naturally occurring and therefore "synthetic". This is what makes a synthetic what it is. It may still be from a "dino" based oil. The end product is still something natural. It was the way we got it that wasn't.

Now to move on to the Group IV and V synthetic oils. Their base stocks are different. Sort of. Group IV base stocks are called Poly Alpha Olefins. Remember how I mentioned alkenes above? An Alpha Olefin is an alkene where the carbon-carbon double bond is between the #1 and #2 carbons in the molecule. Again, it's just a process to create this but the original product was all natural! A poly-alpha-olefin takes this one step farther and is nothing mroe than a polymer made by polymerizing an alpha olefin. This is a Group IV base stock. It was a base stock that made an natural end product through unnatural processes. Group V oils may use different substances as a base stock but still arive towards the same end result which is something natural through an unnatural process.

Now just to throw a little bit of conspiracy into things let get into a human equivalent of the synthetic oil. Lets say a woman wants to have a baby but for some reason the husband's troops are awol. They decide to use artifical insemination. A doctor goes in and fertilizes the egg in a way that is not natural (or fun!). 9 months later they have a baby. Do we consider the baby a synthetic human? Nope. We consider the conception artifical but we don't call the final product artifical. Synthetic oils are a process but the end result is all natural. Their advantages are that we can go in and get rid of or convert what we don't want into something better. In regards to the baby comparison just think of it as gene manipulation to create a smarter human. The bad sides of synthetics have been during the formulation stages early on where some compounds were allowed to exist that didn't do rubber parts any good. This was easily taken care of. The carbon buildup issues have nothing to do with the base stock but rather with what is added to it by each oil manufacturer. This is the additive package.

I know it was long but is anyone still confused as to what the term "synthetic" really applies to? Ther term "dino" oil is very misleading as is the term "synthetic". I don't think any oils should be called synthetic. It's just not accurate.

 

Just curiouse did you take your car for a engine check up? and did it pass?

 

I don't have an RX-8. I've had RX-7's for a long time. Brillo who uses Royal Purple and is more or less my test car, had his engine tested and passed with flying colors.

 

*reads rotarygod's ginormous post*

so, 'synthetic' should just mean 'synthetically made', not necessarily 'synthetic material' in the end product, that's what you're trying to say?